Hvac Wire Colors Brown. The main difference setting each apart is the number of colored wires. The most common color i ve seen used for this terminal and wire designation is a brown wire but this varies and is entirely up to the installer what color to use.
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The rh wire connects to your heating system as opposed to your cooling system. A cooling system with two compressors or a two stage compressor need a y2 terminal so the thermostat is able to control the second stage of cooling. The most common color i ve seen used for this terminal and wire designation is a brown wire but this varies and is entirely up to the installer what color to use.
A majority of the time the hvac wiring color is brown for this particular terminal.
The rh wire another type of red wire is also responsible for 24 hour volt power from your transformer. The main difference setting each apart is the number of colored wires. The most common color i ve seen used for this terminal and wire designation is a brown wire but this varies and is entirely up to the installer what color to use. Hvac systems with more functions need more wires to communicate to and from the thermostat.
